import type { GraphQLResolveInfo } from 'graphql';
import type { Document, ObjectId, StrictFilter } from 'mongodb';
export type Projection<T> = {
    [K in keyof StrictFilter<T>]?: 0 | 1;
};
type Join<K, P> = K extends number | string ? P extends number | string ? `${K}${'' extends P ? '' : '.'}${P}` : never : never;
type Prev = readonly [
    never,
    0,
    1,
    2,
    3,
    4,
    5,
    6,
    7,
    8,
    9,
    10,
    11,
    12,
    13,
    14,
    15,
    16,
    17,
    18,
    19,
    20,
    ...readonly 0[]
];
export type Paths<T, D extends number = 5> = readonly [D] extends readonly [never] ? never : T extends Record<string, unknown> ? {
    readonly [K in keyof T]-?: K extends number | string ? Join<K, Paths<T[K], Prev[D]>> | `${K}` : never;
}[keyof T] : '';
export type DbType = Document & {
    readonly _id: ObjectId;
};
export declare function removeDeepFields<DBType extends DbType>(projection: Projection<DBType>): Projection<DBType>;
export declare function handleExtraFields<GQLType extends Record<string, unknown>, // GraphQL type
DBType extends Record<string, unknown>, // Database type
DBPath extends Paths<DBType> = Paths<DBType>, GQLPath extends Paths<GQLType> = Paths<GQLType>>(fields: Projection<DBType>, dependencies: Partial<Record<DBPath, readonly GQLPath[]>>): Projection<DBType>;
declare function projectionFromGraphQLInfo<DBType extends Record<string, unknown>, // Database type
GQLType extends Record<string, unknown>, // GraphQL type
TInfo extends GraphQLResolveInfo | null | undefined = GraphQLResolveInfo, DBPath extends Paths<DBType> = Paths<DBType>, GQLPath extends Paths<GQLType> = Paths<GQLType>>(info: TInfo, dependencies?: Partial<Record<DBPath, ReadonlyArray<GQLPath>>>, prefixes?: readonly string[]): TInfo extends GraphQLResolveInfo ? Projection<DbType> : null;
export default projectionFromGraphQLInfo;